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pip could not parse the requirement specifier

Invalid requirement: '<requirement>'

pip rejected one of the requirement lines because the package specifier, URL, marker, or requirements-file syntax is invalid.

Invalid requirementconfiguration

Observed message

Invalid requirement: '<requirement>'

Why it happens

  • A requirement line uses invalid version-specifier or package-name syntax.
  • Markers, extras, or URLs are malformed.
  • A requirements file contains unsupported or broken formatting.

How to fix it

  1. Check the failing requirement line against pip's supported requirement specifier and requirements-file syntax.
  2. Correct malformed markers, extras, or direct URL formats.
  3. Remove stray characters, comments in the wrong place, or shell syntax that does not belong inside the requirements file.

Official reference

Requirements File Format

Related errors

Could not open requirements filepip could not open the requirements fileNo matching distribution foundpip cannot find a compatible package versionResolutionImpossiblepip cannot resolve conflicting dependency requirementsrequires <package>, which is not installedpip check found a missing required package

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pip Invalid requirement: causes and fixes | Error Atlas